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import unittest
from test import support
import filecmp
import os
import sys
import subprocess
SYMBOL_FILE = support.findfile('symbol.py')
GRAMMAR_FILE = os.path.join(os.path.dirname(__file__),
'..', '..', 'Include', 'graminit.h')
TEST_PY_FILE = 'symbol_test.py'
class TestSymbolGeneration(unittest.TestCase):
def _copy_file_without_generated_symbols(self, source_file, dest_file):
with open(source_file, 'rb') as fp:
lines = fp.readlines()
nl = lines[0][len(lines[0].rstrip()):]
with open(dest_file, 'wb') as fp:
fp.writelines(lines[:lines.index(b"#--start constants--" + nl) + 1])
fp.writelines(lines[lines.index(b"#--end constants--" + nl):])
def _generate_symbols(self, grammar_file, target_symbol_py_file):
proc = subprocess.Popen([sys.executable,
SYMBOL_FILE,
grammar_file,
target_symbol_py_file], stderr=subprocess.PIPE)
stderr = proc.communicate()[1]
return proc.returncode, stderr
@unittest.skipIf(not os.path.exists(GRAMMAR_FILE),
'test only works from source build directory')
def test_real_grammar_and_symbol_file(self):
self._copy_file_without_generated_symbols(SYMBOL_FILE, TEST_PY_FILE)
self.addCleanup(support.unlink, TEST_PY_FILE)
self.assertFalse(filecmp.cmp(SYMBOL_FILE, TEST_PY_FILE))
self.assertEqual((0, b''), self._generate_symbols(GRAMMAR_FILE,
TEST_PY_FILE))
self.assertTrue(filecmp.cmp(SYMBOL_FILE, TEST_PY_FILE))
if __name__ == "__main__":
unittest.main()
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